Is there a way to search for tickets using the items purchased as a key word?

Go to "Inventory" , search the item. From that item's page, scroll down to its "Inventory History". Ticket numbers and dates are listed for each time the item was purchased. if this is what you already do, I'd suggest that at peak hours you not worry too much about finding the ticket. Instead make your return policy that returns without a receipt may receive a refund of the lowest price that item could have sold for in the last 30 days. It would be nice if a ticket could be looked up by the last 4 of the credit card used, but Springboard doesn't seem to have that ability.