Wow! If you tell someone that you purchased #123 and they know that #123 is shampoo, how is that not the same exact thing as telling them that you bought shampoo? I’m shocked at the sliminess of this.
You don't need to identify the customer.
I did some work with an online supermarket some time ago and I found some interesting associations worth trying like Sliced Brioche Bread + Nutella :-)
Sadly I didn't find any association like 'beer and diapers' ;-)