Hello @Kaimana1,
You can find them using a laptop by clicking on "Host" and then choosing "Reservations".
If you know the approximate date you can click on "Filter" and enter a start and end date.
Otherwise scroll down to the end of the page and click on the number for the last page of reservations.
I've been hosting since October 2016 and have had over 350 reservations and can still locate the reservation of my first guest. I don't know id there's a time or number of reservations limit on this history.
Steve.