Game devs used JPG, what to do?

[Barack Obama]

This submission has been flagged for the following potential issue:

• 35 files used unexpected extension (jpg)
  Expected: png, gif, svg, txt
  

This message is what I get for my Insaniquarium Deluxe archive, but these images are what the devs used and resaving them won't get rid of the (heavy) artefacts. Should I do it anyway or is it okay to submit them like they are?

Btw, the archive has 425 files, 390 are GIF, 35 are JPG.

[Random Talking Bush]

If that's just the way they are in the game, then there shouldn't be any issues with keeping those as JPGs. Just be sure to leave a message regarding that in the submission's staff notes so that we know they weren't accidentally saved in that format.

[Barack Obama]

Yeah, I made a note regarding this.