Sorry to hear you're hitting a road block with taming. Best advice is to not take it personally and to be patient because even something as simple as them taking treats from you, believe it or not
is progress. I agree with cypher, plastic bins have never worked with my russians. With Thea, my first russian since taking a break from owning hammies to go to uni, I literally just laid my hand out in the play pen and after a few nibbles, she kind of just accepted my hand as not being a threat and I was lucky that the rest of the taming seemed to happen overnight. With Oreo, we're still one step forward and two back lol and she's coming on two years old now - ive just learned to roll with her punches hehe. I've never owned a pair though so maybe that's part of the issue, one is feeding off the others' anxiousness maybe? I do think though, with past experience, you sort of hit a a stage in taming where you either reach your goal or you reach your hammies goal if that makes sense? (Brain is slowing down on me now so apologies if that doesn't make a lick of sense lol!). With my Syrians and Thea (sadly no longer with me) they are (were) happy to come out and be handled but with Oreo she likes me one minute and is declaring war the next
