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dANNN
Have noticed while flying around that there are a bunch of different ID's for chests across different zones despite having the same name
Silverbound treasure chest are found all over the place but this specific object ID is showing they have a much higher drop rate of Shortsword of Vengeance and Needle Threader in Felwood and Badlands, based on all the swords I got from Felwood it seems accurate. https://www.wowhead.com/object=207476/silverbound-treasure-chest
If there's a specific item you want from the chest loot pool it might be worth looking it up, just in case it has a high chance from one zone
I have updated my list to reflect your theory; so far it seems to also be true in TBC zones.