There absolutely were. The Western Allies ran into hilariously outdated vehicles like the Renault FT and TKS tankettes. The Free French also captured some unused Char B1 bis tanks, more as a status symbol than anything else, but it goes to show that the Germans had a large amount of vehicles lying around without the crews or resources to throw them into battle for a desperate defense.

As for the Soviets, I have more detailed records. After the end of the war the GRU counted 5000 German tanks "transferred after capitulation". Generalmajor Mueller-Hillebrand reported in a post-war interrogation that 12545 tanks and SPGs were "ready to use" as of March 1945, plus over 800 vehicles deemed worthy only for security service and training, so that's a fairly realistic number. Presumably the Western Allies captured a good number of tanks as well, but I don't have those counts. Some adjustments must also be made for "creative accounting" (for instance, looking at the number of Tiger II tanks lost reveals that the losses reported by the Generalmajor are vastly incomplete), but a few thousand leftover vehicles would be realistic.

The French also operated a battalion of 50 Panther tanks after the war, which would mean that these were 50 tanks deemed suitable for post-war service. Presumably a whole lot more were captured that were not suitable. The British also captured entire factories, with "gently used" and brand new Panthers sent back to Britain for testing, in addition to inspection of hulls in various stages of manufacture.

Sources:

Y. Pasholok Char B1 in German service

Central Archives of the Ministry of Defense of the Russian Federation f.38 o.11355 d.2726 p.42

M. Singer French Panthers

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