What's in your blue box?

In his letter of March 17, BB of S5, claims to have had a total of 21 blue boxes, either cracked, smashed or blown down the road.

Friday, 25th March 2016, 6:15 am
Updated Friday, 25th March 2016, 6:17 am
Blue box

His current box is apparently filled with cardboard.

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What did he fill the others with, explosives?