@AK, not sure if they'll be able to help, but the email address to contact Oboz is: firstname.lastname@example.org. Another thought, if you live close to an REI store, would be to swing in and see if there are any extra insoles in their footwear department - there's no guarantee, and it may be a different brand, but we often have random insoles in our stores! Finally, if all else fails, you can buy after-market insoles however they are often thicker than the originals and will likely change the fit of your boot. Good luck!
@REI-JenKI recently bought some oboz insoles..... from REI LOL. https://www.rei.com/product/148708/oboz-o-fit-plus-medium-arch-insoles