Just to keep traders informed:
If you have a trade where the other trader never marks Package Sent (in other words, his sequence is Proposed/Accepted, Package Received, Transaction Completed), when you mark your package as Package Received, you will find your cards in whatever Collection your wants originally were, all still showing as "In Transaction" (grey colour). You can use the drop down menu to move the In Transaction cards into your collection.
Obviously, if the other trader never marked the transaction as Package Sent, they could never move to In Transit and you marking the transaction as Package Received will not make them jump that step.
Go ahead and ask me how I know.
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0