The eBay photos are dreadful, but the combination of silver furniture and brass scales could legitimately be Garde-Füsilier-Regiment or 5. Garde-Regiment zu Fuß (both were in existence in 1860). Garde-Pionier-Bataillon is another possibility.
I mailed for other pictures and asked for stamps inside the helmet. No reply. The winning bid seems far too low to me for this type of helmet (because of the bad pictures?) .