My Evri parcel went AWOL... but it's a rare item: Can I make the firm keep looking for it? CRANE ON THE CASE

I sell vintage signs and other interesting items online. In May this year,a buyer purchased a rare enamel Duckhams motor oil sign with a working thermometer attached for £365. 

I posted it using Evri's next-day delivery service and paid £7.78.

A few days later,I was told Evri couldn't deliver to the buyer's address because of an 'unmade track leading to the property'. The buyer gave me an alternative address,but Evri said it couldn't deliver to that one,either.

I tried to contact Evri via phone and email to rearrange delivery,or get the package sent back to me. However,I heard nothing.

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