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Were there two separate people sending them to you? If so, it would not be a duplicate.

The only way I know would be to look at the comment. It states the balance.

Supposedly, someone offering 280k pockets for 8.14 sbd sent me 200 pockets as a gift, called up my balance and said "see I sent them" and might have copy/pasta'ed or hacked the system somehow ??? I already had the 200 from you, my friend.

The post should have come from the confirmer bot and have a transaction id. If he just copied something into his reply, it didnt happen!