Hello Racha Zeidan,
Thank you for posting.
If you purchased Bento from us we certainly will be able to retrieve your lost product key. If you did not purchase the product from us but registered it upon installation we will also be able to retrieve your product key.
Because of the need to verify your personal information I suggest you call our customer support line. You will not be charged for this issue.
Customer Support: 1-800-325-2747, Monday - Friday, 7 a.m. to 5 p.m. U.S. Pacific Time (U.S. holidays excluded).
If you are unable to call please let me know and we will find an alternate way to exchange order details.