I am being charged for possession of stolen property because I returned some items at Lowes without a receipt.

I am being charged with possession of Stolen Property. The arresting officer detained me for suspicion of retail theft. I had originally bought some items then returned the items along with other items I had bought a long time ago. The officer claimed that because there has not been a purchase within 90 days that they were "stolen" charged me with stolen property, and proceeded to confiscate almost everything in my vehicle along with impounding my vehicle. My arrest report says I was arrested at Lowe's but that I have stolen property from Home Depot. The cop himself said that he has no proof I stole anything. He also said "I know what you are up to but I can't prove it".