

Ha Ha!
Yes. All chests have specific IDs found in the blocks.dat file, which is encrypted
But the good news is that I do have all the chest codes from a previous jj version's blocks.json file (unencrypted)
Plus, I found the id for the new skull chest from the Halloween update!
Here's the list:
wood chest
id 98
hex 62A0
________________________
diamond chest
id 102
hex 66A0
________________________
hell chest
id 234
hex EAA0
________________________
strong gold chest
id 101
hex 65A0
________________________
egypt chest
id 216
hex D8A0
________________________
maya chest
id 217
hex D9A0
________________________
jungle chest
id 218
hex DAA0
________________________
mushroom chest
id 233
hex E9A0
________________________
graveyard chest
id 865
hex 61C3
________________________
skull halloween chest
hex D3C2
Hope to you see what you do with these!
