One place I played had tubs like the ones twiglets and cheeselets come in at Christmas, they were painted black on the bottom and gold around the top much like a Duracell battery, there were 4 hidden around the site, you needed all 4 to place in slots in a box which would then be linked to a pyro maroon and fired to signal the game end. Essentially it was a firing box and you needed the powersource to activate it. This was at a CQB site so fighting room to room to find all the bits.
Another was 3 steel vacuum flasks each with a biohazard sticker on the side and a black pelicase clone with foam lining. You first had to find the 3 containers of a biological agent. These had to go in the case, only one person could carry the case and while it was in hand they couldn't fire their weapon. The case carrier was also the only person who could handle the flasks. These then had to be taken to a location designated as the destruction point for the flasks. The opposition team was split into 3 groups, one for each flask, they could choose how many people they had for each one but they weren't allowed to guard more than one flask. The distribution of players was up to them so they could choose to defend only one really heavily, or they could spread their forces evenly. All defenders when hit fell back to the destruction point.
A CQB site had a large rugby tackle pad with 6 handle loops. So you carried it a bit like a stretcher. Minimum 4 players to carry but 6 were needed for longer distances. You couldn't shoot with it in hand, you carried it from location to location within the game area as radioed to one of the players in the team by a marshal. The rest of the team had to clear routes for those carrying the casualty. The stretcher was the regen for the defending team.
One has 20 memory sticks, cheap crappy or even freebies (could be keyrings or something else small, but depending on how you play it if they had access to a small laptop capable of downloading pictures/data they could contain data for extra objectives) these were hidden in various locations, you were given a series of photographs which gave clues to the locations of the mem sticks. These could be close ups of things like light switches or prominent trees.
A site has 2 overalls with the arms and legs sewn shut, and a stretcher, you carry the stretcher and find the downed airmen. Or in their case injured drivers of a landrover, you also had to find and destroy the landrover with a satchel charge, a huge maroon like a Mk9 or something.