More than 750 historic artefacts are still unaccounted for, following yesterday's fire at the Cuming Museum in Walworth.
Around 500 items have been recovered from the building, some of which are badly damaged.
Among the objects still missing are two 19th century jars that were on loan from British Museum.
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Stamp duty is to be abolished for first-time buyers on properties up to £300,000, Chancellor Philip Hammond has announced in his Budget.
The money will help pay for mental health and counselling services, regeneration in the west London neighbourhood and a new community space.
The small device was hidden in a grate in the ceiling in the only customer toilet at a Starbucks coffee shop.