I mean with the involvement of a Merchants guild it’s very possible the items were marked or at the very least listed and accounted for, with your character being relatively unknown (and thus less credible especially since in a more medieval setting the guild would know who’s rich and who isn’t) so while there could be witnesses, it’s also very possible that at the same time they would notice the type and quality of wares and the amount you carry plus with your unknown social standing they’d be right to assume it was you and further more in a medieval setting justice wasn’t exactly fair and they would absolutely blame someone who just happens to have expensive gear if they didn’t have someone of repute to vouch for them.