I stopped playing this game for this very reason last year. Started playing again, get to rank 35. Get the shovel, supposedly a supply crate, and an unlock token. But wouldn't you know it, no crate. I haven't received a single crate awarded to me from ranking. 2019 and this still is an issue?
There has been a problem with receiving crates since day one, nothing has ever changed in this matter. I too just started playing this title again and I was surprised that items were still locked because an event was over.