24v solenoids, What year(s) and how many ?

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Anyone remember what year(s) 24 v solenoids were accidently shipped in the kit and how many there would have been (2 24v pilot values per double acting solenoid and 1 per single acting solenoid). I would have thought one year (ie five 24v pilot valves).

Unfortunately I found TEN 24v pilot valves mounted on solenoids on our in our inventory (the hard way, by installing them on our 2008 robot: ouch).
Unless SMC twice shipped 24v valves, all I can think of is someone on our team in a past year ordered some more 24v solenoids accidently based on part numbers of the existing solenoids not being aware they were 24v solenoids.

Now we have $200+ worth of 24v pilot valves. Anyone have any use for them ? I guess they are the norm in industrial installations.