Menards Receipt inquiries that stole my item PORTAGE Indiana

I when to returns some gutter covers I had sitting in the garage at a Menards. I lost the receipt as been over 2 months and was cleaning out the garage to get rid of stuff and make some room. Did purchase them at menards and did see that you can return without receipt, so figure I give it a shot and figure worst case they will just refuse to the return.

What happened next I would have never expected? So walk to lady at the counter told her I lost reecept and been 2 to 3 months since purchase them. She stated you just need a ID, or driver licence  which I provided and that they would accept them back as most was unopened.

Then she scanned them and stated that it be store credit and for the current sale price since no receipt, which I was fine with. Then manager came over and handed me a receipt inquirie and stated I would have to email them to get the store credit.

The issue is they won't give me back the cover, even after demanding them to and already took them behind the counter, otherwise I would have just forcefully grab them back and walk out of store as they can't call cops and even if they did It my item and walk in with them.

So now they stole my items, no reply let to the email I sent off and considering taking legal recourse even if it cost more then the covers as they stole them pretty much. 

I never done returns before at any Menards and bought stuff about 3 to 4 time in the past 3 years. I don't have a history of doing returns and zero reson they sure have took my covers I paid $129 a box for. To be treated like a criminal and my item stolen from me is unacceptable.

I get if they wanted to refused the return due to no receipt as well within their right? But to steal the item right under you?