It is very difficult for us to suggest prices, especially if we are interested in any items you have.
I would suggest that you look at eBay for similar items and if you want to, sell these at a slightly lower price if you want to help any members out.
If you want top prices for them, you could advertise them on eBay.
The secret is to find out how much the Undertray and the storage tray are from a dealer. People often have to guess at values and sometimes get it wrong and accidentally advertise them at a higher price than they are from a dealer (new).
So a combination of the eBay prices and dealer prices should give you an idea so that you can get a fair price for them.
The climate panels vary in prices from £30 to £75
I THINK the trays are around £100 new (the problem being that they are difficult to package and send.
I THINK that the storage trays are around £60 new.
I realise that you are genuinely asking for help so I have tried.
Steve B