By default Collection Manager will deliver a new record for every title in the collection. If you’d like to filter your first record delivery so you only receive records for the newly acquired titles you have not yet set holdings on in WorldCat, make sure you use the WorldCat Holdings filter.
The filter setting can be found inside the collection in the Holdings and MARC records accordion. Once Enable MARC Record Delivery is enabled for the collection, the WorldCat Holdings setting will shown. Change the filter setting to No if you want to filter your record delivery.