How to tell which account I used in Mac App Store

Apart from laboriously logging in and out of accounts and perusing the Purchased list for each one, is there any way to tell which account I used to buy a given app?

I archive every app-purchase confirmation email Apple sends me. A simple email search tells me which account for any given app.

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If you set the accounts on the Family Plan then you can easily switch between purchases on the different accounts. Frankly this was the only way I could solve the chaos I had from setting up two accounts for myself.