If a hold is moved from bib A to bib B (or from item A to item B), and no change was made to the hold before the move, there is no way to identify the bib or item number of the original hold. To replicate: -Place a hold on bib A (or item A) -View it in Tools > Logs using the reserve_id. As is standard, no details other than the reserve_id show in the Info column. -Move the hold to bib B (or item B) -Run the holds log again for the reserve_id. Note that an entry is generated for the move, but only the bib number (or item number) it was *moved to* shows. There is no way to know what bib or item the hold was moved *from*. If a change is made to a hold before it's moved, staff will be able to see the original bib number/item number in logs. But there are likely to be many cases where the first change made to a hold is moving it to a new bib/item, which means that the original bib number/item number will be untraceable.