I imagine the plastic would have been marked as recyclable as that’d be in keeping with the message. It’s highly likely they were but it seemed ironic. It will have been thermoplastic but some of them can only be reused once due to additives. Let’s hope they are reused at least once.
I saw an ad saying a certain car came with mats made from recycled drinks bottles as if was something new and remarkable. Fleece fabric and mats have used PET recycling for some time now. Telling people their mats which sell for £60 just reinforces the markup!