I do not always keep receipts, although my online groceries automatically give me an online receipt. However, it is worth keeping a receipt for an important item. This is actually also a guarantee document and is now almost nine years old showing when I bought my Mac computer on which I write my blogs daily. At 10.21 hours on 24th October 2014 I bought it. I seem to have got a good rebate on that day. It is still my faithful companion, I gave it once for a service after five years as even Apple can get worn down, but it still serves its purpose. I also got a new keyboard a few years ago as the original decided not to print a few letters, but now everything is working well. For a computer almost 10 years old it has served its purpose well.