I just created the set here after seeing your post:
https://www.tcdb.com/Checklist.cfm/sid/223913/1994-95-Upper-Deck---Box-Bottoms
The Gretzky was listed as a standalone. I've put in the report to get it moved.
Gretzky was on Series 1 boxes, Renberg on Series 2.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 10/25/2023). I have added a large portion of my inventory to the site, and currently have trading turned off (details are in my profile). I have (finally) unearthed my 2 very large boxes of Star Company minor league sets and they are available (email for details).