I don't know if it works for non-company members but I traded with my friend and when he had his stuff in his side of the trade window I just took it out and put it in my inventory. No-one involved the in the trade needs to hit accept and you can just steal stuff.
https://www.playatlas.com/index.php?/forums/topic/68265-secure-trading-is-not-secure/ exact same post on forums incase anyway suggests I make a post there.
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