It's still in the bag. It's just been too cold to have any liquid. Once the ice thaws, you will have your 2% back. If you thaw out about 2/3rds or 3/4ths of the ice, your left over unfrozen sap will be >2%. Then you can throw out the ice. If you have bags with PVC holders like I do, I had to wait until the temps were in the 40s for 2 days then I was able to get it all out and break up the ice because it gets soft.
Chad
2014: 12 taps, 5 gal buckets
2015: 15 taps on bags
2016: 150 taps: 100 on bags, 50 on 3/16" natural vac, 2x8 AUF/AOF Homebuilt Arch, 2x8 SL Drop Flu & Auto Draw, SL Propane Canner/Bottler
2017: 225 taps: Built Lean to, Added SL hood, preheater, concentric exhaust, SL SS 7" SB Filter Press
2018: 180 taps: Added Shurflo to 50 - 3/16", Auto fill sensor to head tank
2019: No tapping
2020: 175 taps
2021: 300 taps, homemade RO and releaser
2022: 600+ taps