Cage did definitely own a second Action 1 which was CGC'ed and was part of the 2002 auction sell-off. That's on the record.
However, here's what I find interesting about that scan:
It looks like the copy in the LAPD stolen art database (note the vertical shadow line across the left third of the book, and the spine stress on the lower half of the book)
Did Cage's people send them the wrong scan all that time ago? That would seem to be an unfortunate error.
And of course, it makes me damn curious to see a scan of the recently recovered copy.
However, It does seem to lend credence to the idea that the Tec 27 in the LAPD database is also the stolen Cage copy. But is the Tec 1 they list a stolen Cage book as well...? To my knowledge, that book has never publicly come up in connection to this incident.