I would hang onto him unless there is an overpayment involved. Someone who has scored 10 points in his first 12 NHL games is already a guy "who can help with points this year" as long as that back issue he had stays under control. NYR is not having trouble scoring points and Buchnevich's usage suggests he will be in a prominent role all year long and into the future.
I have been reading some articles this evening and Buchnevich has appeared in several of the usual "pick these guys up" pieces you see on Sundays and Mondays. You might get some interest as a result.