You were misled a bit. they weren't worth $1000 then. More like $700-800.
The 604 is the better of the two. For a single in good shape maybe 600-700
The 602 is worth less. Substantially less. I've seen good pairs that couldn't get a $500 offer. If you could get any offer over $200 I'd consider it.
You could try selling together. If mine I'd sell separately. They aren't a pair. One was likely running as mono and perhaps the other added to give stereo. I's not uncommon to find older speakers as singles.
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