Boeing 727, perhaps you would know:

Short of receiving the 'original receipt', what other tracking of the original purchase may occur? Some things I bought need to be exchanged, which would be easier with at least a copy of the receipt -- but I am concerned that any computer reference to the original transaction would show exhanges (usually showing as returns of the original merchandise and re-purchase of new) past the 6/16 deadline (if this makes any sense!)