Ultra Agents Collection (5004554-1) is a LEGO Ultra Agents set from 2015. There isn't enough recent sales data for a reliable price estimate.
Yes, Ultra Agents Collection was released in 2015 and has been retired from retail for several years. Retired LEGO sets are only available on the secondary market through BrickLink, eBay, or other resale platforms.
Use the parts list on this page to check every piece. For the minifigures specifically, you can use the brick'em scanner to identify each figure from a photo and confirm it matches what should be in this set. Missing pieces can be individually sourced on BrickLink.
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