I agree... when you don't have them and cannot score a free one from a music retailer, UPS has great boxes and packing materials.
Or- do what I do. Buy another guitar, and when it arrives- use THAT box.
I use this size. Probably costs a little less to ship than the bigger one. https://www.uline.com/Product/Detai...5-lb-FOL-Side-Loading-Corrugated-Guitar-Boxesdon't be cheap, buy 6 and keep them around
invest in a nice tape gun too
https://www.uline.com/Product/Detai...8LdUmDLQmslEgdsrceUaAtoBEALw_wcB&gclsrc=aw.ds
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it's important not to be an imbecile