When I geot on ships, especially at night, sometimes but not often, I encountered Chinese people with backpacks walking quietly and quickly.

You're still talking about the past, right?

Sometimes but not often, I might encounter some Chinese people with backpacks walking quietly and quickly.

This was an incomplete sentence so I deleted it and added it to the previous line.

I highly suspected they were illegal imemigrants to Hongk Kong.

"Immigrants" is used for people coming into the country. "Emigrants" is used for people leaving the country.

My boss warned me not to care about andthem nor talk to any of them, w. We pretended not to see each other.

They may behave been organized by some human smugglers, helped by some crews and stationed soldiers, or even their commanding officers.

That was a felony against law,so no one dared to say it in public.

Our job was only to sell fresh food to captains, with whom we were legally licensed.

One day, I talked to Ahai about the suspicious people I had metseen on the ship.

"Met" means you did more than see them.

He said to me, "Director Chen has told me, and l this. Let me tell you that we can directly report any suspected stowaways to him.

If thea case is confirmed, he wouldill reward 5,000 yuan to the reporter 5,000 yuan for each person.

Oh, when I got the newsis news, it really scared me a lot, because I was already brainwashed by my boss when I came to the company.

This is a sentence fragment so I added the next sentence to it.

It really scared me a lot, because I was already brainwashed by my boss when I came to the company.

My boss had warned serious toseriously warned me, "This is the border!

dDo not make friends with any soldiers; do not report any smuggling or stowaway actions in case you see ityou might see to the army; do not introduce young women to crews even if they are getting out of the ships.

My boss was right, h. He had much more experience than uswe did in working at these three ports here.

When I geot on ships, especially at night., sometimes but not often…

You’re still describing your experience in the past, right? If so, “get” should be “got.”

This sentence is incomplete—merge it with the next sentence.

I highstrongly suspected they were illegal immigrants to Hongkong.

My boss warned me not to care about andshow any interest in or talk to any of them,; we pretended not to see each other.

They may behave been organized by some human smuggler, or helped by some crews andor stationed soldiers, or even their commanding officers.

That was a felony against law,, so no one dared to saydiscuss it in public.

Our job was only to sell fresh food to captains, [and we were legally licensed to do this | according to our legal license].

One day, I talked to Ahai about the suspicious people I had metseen on the ship.

“Met” implies that you came quite close to them, or even talked with them.

He said to me, "Director Chen has told me, and let me tell you, that we can (directly) report any suspected stowaway (directly) to him.

“Directly to him” is much more natural.

If the case is confirmed, he would rewardill pay a 5,000 yuan reward to the reporter for each person. / each stowaway."

“If the case is confirmed” doesn’t sound natural, but I don’t have enough context to fix it.

It really scared me a lot, because I washad already brainwasheen indoctrinated / catechized by my boss when I came to the company.

“Brainwashed” implies that your boss had manipulated you into believing something that was false. I don’t think you mean to imply that he was wrong.

My boss had warnedgiven a serious warning to me, "This is the border!

dDo not make friends with any soldiers; do not report any smuggling or stowaway actions in case you see itvity that you happen to see to the army; do not introduce young women to crews / crew members even if / when they are getting out off the ships."

My boss was right, —he had much more experience than us in working at the three ports there.

I highly suspected they were illegal immigrants to Hong kong.

or "they were illegally immigrating to Hong Kong."

My boss warned me not to care about andor talk to any of them, we pretended not to see each other.

They may be organized by some human smugglers, helped by some crews and members or stationed soldiers, or even their commanding officers.

That was a felony against law, no one dare to say it in public.

My boss had warned me serious to mely, "This is the border!

dDo not make friends with any soldiers; do not report any smuggling or stowaway actions in case you see it to the army; do not introduce young women to crews even if they are getting out off the ships.