I suggest maybe that you now also write a letter to the alleged recipient. Inform them that rightly or wrongly they have been implicated in the disappearance of a plated cutlery set. That you have tried to reach them that you understand that they have blocked your correspondence.
As a result of the information received from DHL you have now informed the police and you understand that they are investigating.
I would suggest that you tell the alleged recipient that you will shortly be issuing court proceedings against DHL and that if the matter does come to a hearing that it is likely that they, the alleged recipient, will be identified and referred to in public documents.
Also, in respect of the police, I understand that you have reported this to the police and they undertook to contact you and to begin an investigation – and they have not contacted you. Surprise surprise!
I suggest that you get onto the police immediately chase them – by telephone and also in writing. Point out that you had a conversation on XXX date and you brought to their attention that according to DHL some valuable property of yours had been inadvertently delivered to the [alleged recipient] and that despite the fact that the officer involved promised to get back to you, they have not done so and so far you do not have a crime reference number. Tell them that this is essential that this matter is taken seriously because it is currently being taken to court.
Don't worry about putting the correct figure. Simply warn her that it is likely that the fee will be involved which you understand "maybe as much as £350 – blah blah".
The important thing is to get the letter off quickly and to have a paper trail. You don't have to worry about all the teas crossed in the i's dotted et cetera
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