[Item duplication]

After initiating a trade with another user(My Chrome Prime Chassis BP for his 14p) and accepting the trade, the UI lagged for a moment. During the lag, the other user thanked me for the trade. Shortly afterwards, the game informed me that he had left before the trade had completed and I could cancel the trade or continue it later. After questioning the other guy, we realized that both of us had the chassis. After a minute or two, the platinum appeared in my balance.

What should I do with the chassis blueprint? Just sell it for credits?

EDIT: Also, the trade doesn't seem to have detracted from my daily limit.

EDIT EDIT: Two hours later, the chassis seems to have disappeared. So I guess this problem is less item duplication and more trade delay?