This particular pieces looks to be like a vintage mail sorter. If you haven't already, consider searching local antique stores and vintage markets. You may be able to find a piece like this on Ebay.

If you are okay with something more utilitarian, shoe cubbies and mail sorters of the contemporary age can be found online and through many common retailers.

Best of luck with your hunt!

Staples has some kind, but I am afraid cellars are too small for two.

Target, you have to buy some units.

Check IKEA hacks for Kallax storage

Since that one is handmade, you probably won't find something just like it. Here's an option from Wayfair - https://www.wayfair.com/storage-organization/pdp/manzanola-shoe-cubbie-bench-in-drifted-gray-lfmf2978.html

Maybe when husband has more time, he could add some trim molding around the top.

Here's a great one on Etsy for $795.00 plus shipping https://www.etsy.com/listing/617022358/large-rustic-wood-cubby-unit-primitive?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=mail%20sorter%20cabinet&ref=sr_gallery-1-1&organic_search_click=1

Overall - 80" tall x 54" wide x 15.25" deep