I need your opinions (yeast storage)

Well I was gearing up to brew a honey wheat today. I went to the fridge and grabbed my yeast. I sanitized the package and my scissors, and went to cut open the packet. That's when I realized it was my package of Notty and not the Munich yeast I needed. The problem is that I made about a 1mm incision into the packet. I immediately sanitized a mason jar and lid and put the yeast in the jar. Should I just throw it out or should it be ok?

I wouldnt throw it out. If everything was nice and clean, im sure it will be fine. (in the fridge)

Once the package is opened, the oxygen gets to the yeast cells and it's not good for very long. Maybe a week or so would be ok. I can't remember all of the science behind it, but it has to do with the package being sealed in an oxygen-less environment and when oxygen does get in through opening the package, it changes the environment of the dehydrated yeast. I think it was David_42 who explained it to me, but I'm really not sure.

I wouldn't worry about it personally, but if you want to be safe, make a starter. It's not optimal for dry yeast, but that will give the yeast something to do and you one less thing to worry about.

Well for future users with similar questions I have found a good answer. I found this on the danstar website "Nottingham will rapidly lose activity after exposure to air. Do not use 500 g or 10 kg packs that have lost vacuum. Opened packs must be re-closed, stored in dry conditions below 4°C, and used within 3 days; 11 g sachets are not vacuum packed but are flushed with nitrogen gas to protect the yeast"