Tabs with a mushroom stamp? Like an ecstasy-style press pill? Sounds like someone's trying to pass of 4-AcO-DMT as mushrooms, and they made a typo. Never heard of 5-AcO-DMT ever being made, as it would be an ester (and thus prodrug) of the supposedly uncomfortable psychedelic Bufotenin (5-HO-DMT)... But we don't allow ID threads so I'd ask your dealer where the heck he got these confusing mistakes.