Footage captured by a neighbour showed the thief in Orpington, Greater London , on Edgewood Drive swiping two of the covers in the middle of the night.
The major motorway is currently closed between Junction 3 (Swanley) and Junction 4 (Orpington), with congestion piling up back to Junction 2 (Darenth Interchange).
Bethany Clarke (left) and poison victim Simone White (right), from Orpington in south-east London, were on a night out in Laos when six shots resulted in tragedy.