I purchased a 2016 Volt last December under the same circumstances and received the Fed Tax Credit without any issues. Just make sure the dealer provides you a copy of the MSO. Carfax should also show whether the car was ever titled.
How aggressively is it priced? Edmund's says that year 1 depreciation is $12,793 which factors in the tax credit. So if you can not claim the credit, their asking price should be at least 7500 off MSRP. If GM didn't/couldn't claim the credit as if they leased the vehicle for 249 miles, that is their problem. Its not worth saving a grand or two and missing out on the credit, especially if this is the last year for the credit. I'd say find a deal on an actual 'new' car instead. You might also seek the advise of a tax professional who has dealt with this type of scenario.
But, also realize that dealers don't know how the tax credit works. They may indeed not know what the heck they're talking about. If they think it doesn't qualify, then have them reduce the price by $7.5k. If it turns out that it does qualify (because never titled as you say), then you can get an additional $7.5k.
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