Any idea how the warranty works if you bought the chair slightly used from someone else? I know it was originally bought from an authorized reseller, but I'm not the original purchaser. Their warranty support page is a bit cryptic on this topic.
The warranty is based on a label at the bottom of the seat. If yours still has it you should be able to get warranty, using a serial number that's on the label.
Source: previously owned a used aeron. currently have an embody. Never had to use the warranty, but looked up this info when purchasing a previously owned chair.