I've never had issues with sending via NF as long as the items are legit (not scammed/stolen from someone active or ABed).
I've sent multiple high tier stamps and BD items to my main in the past. I usually test it out by sending to a side first that I wouldn't mind if I lost it, let it sit for a few weeks to a month, then send to my main. No issues so far.
If they've been secured for that long they should be good, but if you're wary send to a side first.
I avoid TP because TNT flags trades more often, and it also puts items within the public eye.