Contact the South Point, find the cost for them to issue a new set of SP tournament chips. Pay them that cost in exchange for the return of the "old" set (missing a few).

Sell the old set on "The Board", , wherever. Depending on the SP cost for a replacement set, some $$ might be made here, and it takes the wind out of the resale value of the person that took them.
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The SP exec that sells you the old set is automaticaly fired and more than likely losses his gaming license.

Is that answer good enough to qualify for bashing?
Gaming paperwork is filled out before any NCV's are approved.
One line on it.
When and how will the chips be destroyed?