To greatly reduce risk, try buying them off from TB Classifieds. The guys and girls here, being bassists and gear lovers, offer more peace of mind compared to CL or similar.
Heck I bought mine (Shuttle 6.0) and shipped it from US to Indonesia.
It's not vintage gear, but it goes to show the people here are great to deal with

I prefer buying used gears that has been proven to be quite durable and long lasting.
Just make sure you see the gear yourself and put it through its paces before buying.
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Top of the line vintage gears" sound like all-tube amps, the kind that I don't want to foot the shipping for. That's just me, and it gives me a reason to find local deals and look the gear myself. Cheaper in the end too.