As some background, the expense report that I am specifically wondering about comes from the PI and contains a significant amount of travel expenses budgeted for and allowed on the grant. The only real issue with the expense report is how late it was turned in. The traveler indicated that the delay occurred due to being out of the country for an extended period, and subsequently misplacing some of the receipts.
Any thoughts or tips on how people have dealt with this issue in the past would be greatly appreciated.