The burping thing is a last ditch effort to try and get a puffer to expel some air. Unless you are sure he gulped air you do not want to try it, it's is a bitch to do.
I assume this is a recent purchase. It's not unheard of to see a young puffer do this sometimes, especially if it is stressed. Check you water parameters to be on the safe side but it is probably just adjusting to it's new home.
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