Place packet inside cover of the book. There may be multiple orders attached to one bibliographic record. To prepare the invoices for return, wait until you have processed the invoice electronically for regular approval so that you have all the returns at once. With Form Selections, wait until you have all the books to be returned on that invoice. Match stack of book returns with invoice.
Color wash the rejected titles on the printout that is with the invoice.
Unstaple the invoice. Cross out on the invoice the titles of the rejected books. For electronic invoices, you only need two copies - the top white goes to Accounting and the pink goes with the books. The other two copies can be thrown away. For Form Selections, the top 3 copies go to Accounting, the bottom white goes with the books.