Whenever I need a receipt I never find it.

My best friend browbeat me until I did this.

Get a box - a shoebox or a plastic box - and put it on top of your refrigerator. Toss all receipts in there the minute you hit the house.

Use your mobile and screenshot it.
That way you'll always have them saved to one place and all accessible.

Use a scanner and save the image to your hard disk. ===> peace of mind.

Keep them all in one place, like a box