NEC3 ECC: Lost/Missing Equipment

How does NEC Option D deal with lost equipment? Our contract specifies that any monetary benefit from procurement of equipment shall solely be for the Employers account. i.e revenue from selling the equipment less storage and processing fees.
If equipment were lost/missing benefit will no longer be realized. Can the Employer charge the Contractor residual values of missing equipment as his perceived benefits were gone. Security of the Site is the Contractor’s responsibility.

Potentially yes the amounts could be recovered as a claim for breach of contract as the Contractor failed to secure the site with the loss being the residual value of the missing items.