The fact that the box or 1200 itself is from the Philippines isn’t relevant. I have the same box, for instance, and my machine was a US unit. Look for a thin barcode sticker on the box. It should say “A1200 US” or similar (A1200 UK, A1200 DE, etc.). That’ll tell you where the machine was originally sold and, therefore, the language of the manuals it shipped with. The green sticker in your second image suggests that your box was originally for a European market, but I don’t know which one.
You can see an example of the kind of sticker I’m referring to in
this image. It’s the one in the upper left next to the silkscreening. You’ve probably seen one before, possibly without realizing it. Commodore started slapping those stickers on virtually everything starting in 1991 or so. It looks like there might be one in your third image, all the way to the side, but it’s too small for me to read.
EDIT: Wait, there it is in the second image, below the second 0 in 1200.