NYS registration and inspection stickers.

I've been out of NY for five years, but the NY registration use to have instructions on attaching the small square sticker to the lower right hand corner of the license plate. I don't think it would be a big deal whether you were attach it to the lower left or right corner of the plate as I think any law enforcement officers would just be checking to make sure the trailer is registered. I always kept the rest of the registration with the tow vehicle's registration and insurance documents.