Da Luz Covers Japanese Occupation

Hello

My name is Antonio da Luz, grandson of Henry da Luz.
I have recently opened up my collection of stamp covers that seem to contain various Philatelic covers, ranging from various postal offices. Including a few dozen that are marked Rare Kowloon City.

I am trying to understand the chops on these covers and get an understanding of the value of these items. I have contacted a few people, however, very few seem familiar.

I was wondering if anyone is familiar with these items. If you could either reply or send me a PM that would be wonderful.

Very nice postmark of Kowlong city east! I like it!

Thank you sir !

I was wondering if you knew the value or if there was a way to identify the chops?