I thought I'd save up all of my small loot boxes and then open them all up at once. The most interesting drop was the Grand Rink.
In total, this is what dropped.
Small First Aid Kits 67
Small repair kits 68
Large Repair kits 32
Large First Aid kits 17
Fire extinguishers 76
Auto Fire Extinguishers 13
Garage slots 17
Training booklets 40
Directives 103
Level 5 decorations 49
Level 4 decorations 131
Level 3 decorations 234
Grand Rink
2130 total decorations.
Total credits dropped, 4,140,000.
Source: https://www.reddit.com/r/WorldofTanks/comments/kump6m/drops_from_710_small_loot_boxes/