Today I'm a giant ass

I accused my oldest son of swiping my wallet out of my purse, and he didn't. Just as a little back story, he's been in trouble many times before for stealing. He's taken money, game boys, video games, anything he can get his hands on, but not my wallet. I thought maybe he had taken it, knowing I had some cash in there and stashed it because he didn't have time to take out the money out before someone came into the room. I thought he would take out the money, and return the wallet hoping it wouldn't be missed, and that when I discovered that the money was gone, maybe I would think my husband needed the cash for something. He's tried that before, since my husband and I work opposite shifts and then he goes to school while I'm at work, we're not usually in the same place at the same time and it's easy for him to get away with it, which he has on more than a few occasions. In any case, I was wrong, he didn't do it.
In actuality, my wallet got left behind at the noodle place I picked up dinner from last night, but because both of my younger children said they had seen it in my bag since we had gotten home I thought it was not very likely that I had left it at the restaurant. I stayed home from work, and kept my son home from school until the noodle place opened this morning and I got the news that they did indeed have my wallet.
I apologized humbly and sincerely to my son before taking him to school and going to work. We've talked about it and he acknowledged that he is the logical first choice when something goes missing, that even if he were guilty he would profess his innocence, and that he wasn't actually punished, and wouldn't have been unless I could have proved he had done it. All those things aside, I still accused him, almost certain he was guilty, and as I said before, today I'm a giant ass.