To sum it up, I have 1 hive left after losing the other in my yard a couple months ago. It threw a large swarm, the remaining bees got too low and I lost the hive to SHB. I froze all the frames and treated the ground with gardstar, covered with a tarp for a few weeks to prevent other bees from getting to the poison (just my quirk). The other hive seemed fine for a while but recently I realized it was queenless when I pulled my honey super. No brood or eggs at all. I saw probably 100 SHB and killed them. I froze the honey and I bought a queen and placed her in last Saturday. I only saw maybe 15 SHB then and no still larvae at that point. After 3 days I released the queen and she seemed to be accepted fine yesterday. I saw more SHB adults and tried to kill as many as I saw. Unfortunately, in trying to search and destroy beetles, I spilled some uncapped honey out and inadvertently started some robbing activity from I guess some feral swarm living nearby. I closed my entrance down to where only a single row of bees could squeeze through and that seemed to halt the robbing. Today I bought 2 frames of brood with nurse bees and placed them in the hive as well because the hive desperately needs more bees. The major concern I have is that when I pulled the 2 old frames out to replace them with the brood frames, I saw a single SHB larva that was about 4mm long. Of course there are more waiting to be seen and of course, more adult beetles. I froze the 2 removed frames but I'm not sure where to go from here. The hive still has its honey super on. I think i should I remove it and freeze that honey to kill any potential beetle larvae in there but what else should i do? Is it likely too late to save this hive? I'm concerned that if I spend a bunch of time in there tomorrow I'm going to spark more robbing. Any advice is welcomed.