As I said before, a guy asked the same question on the Kayak Forum. My friend Ron's reply:
good question.
I would start with the top two pieces, assemble the ferrule.
Gently make a casting motion (not necessarily a wiggle, a stroke is a better idea) - make it gentle, and feel for a click.
If it clicks, ferrules need re-setting.
Do the same with the lower ferrule.
Now this is very gently. Gently twist each section while holding each end - you're looking for glue disbonding in the 6 strips.
Hot garage storage is a bad idea, because this could dry-rot the cane, and it may not show a visible sign.
It's also bad for drying out the varnish - cane likes to live where we live.
The second deadly possibility with outdoor storage is mildew - this shows up as dark spots in the rod, and you can pretty much see the biological attack going on there.
Though note that hot garage is not as bad as hot attic for dry rot.
If you get the rod through my first two tests, I'd recommend at least lawn casting it, but could take it fishing.
If it's dry-rotted, may break without warning, so you have to decide whether you want to risk that vs. having a wall display piece. If it's dry-rotted, there's no remedy.
If you plan to have the rod restored (re-wrapped, re-varnished) I can recommend great cost-effective people for a restoration.
There's a very good book by Michael Sinclair if you want to take on a restoration.
https://www.amazon.com/Bamboo-Restorati ... 1882418115
If it's a really valuable rod, it's worth the trouble to restore even if cane pieces are broken (and not dry rotted) - broken cane can be scarfed by a good builder (Dennis Stone does incredible work here, making a glued joint that fits together like two rook towers).
The 1915 Leonard Fairy Catskill that I showed above (and again below) was mess from a leather box of other destroyed rods - it was the only one that had anything of value, and I paid salvage value for the hardware.
It had one short tip, missing the other, a bad mid scarf, missing mating ferrules from each joint, and half the guides gone.
Dennis scarfed the mid, machined the needed ferrule halves, scarfed one tip and made a second tip.
(Small diameter cane tips are his forte.)
He of course made the needed snake guides, saved every original wrap and made the new wraps look like the old.
I ended up with $750 total in the rod, which is also its value,
Hope that helps, IslandJim