I've bought a used Kinesis fork that was advertised with a boost hub spacing. It really has 110mm of spacing, but the labeling on the thru-axle that came with it irritates me. :
100mm/110mm Fork Mountain Bike Hub Thru Axle Adapter 20mm To 15mm Aluminum Alloy | eBay
100mm/110mm Fork Mountain Bike Hub Thru Axle Adapter 20mm To 15mm Aluminum Alloy | eBay
MTB Mountain Bike 20mm 15mm Thru Axle Adapter for 100mm/110mm Fork Cycling Tool 2 | Catch.com.au