Did I get an RL01 pack instead of RL02?

I bought an RL disk pack on Ebay, supposedly for an RL02 drive. It is a Memorex "Mark III T" with a small label "Made in USA CI 04050" and various previous-owner stickers/scribbles showing first use in 1983 up through 1985. The shock indicator is not red. But it won't load in any of my four RL02 drives (the Ready light never comes on, so track 0 is not being found)! Since the drive has embedded servo info, so head alignment between drives is not an issue, there are only two remaining possibilities that I can think of: 1) the pack is defective (factory servo tracks are trashed), or 2) it is an RL01 (5 Mb) pack, which looks physically identical but will not work in an RL02 drive. Any thoughts... Would this be the likely result (no Ready light) of putting an RL01 pack in an RL02 drive? If so, anyone want to buy it (or preferably trade for the proper pack)? thanks Charles