I still use an airlock for my sours, but they are in a barrel, getting small amounts of O2.
That is where my beer wound up as well....I have the nails to use if I desire, but just cannot seem
to make myself put a nail hole in my oak cask....Airlocks have not moved much in a few weeks now...
Seems they resemble thermo/manometers more than airlocks now...liquid level moves when the
ambient temp changes...or when atmospheric pressure changes.....I cannot help but wonder how much
they might be inhaleing now and then as a few small inequalities allow air bubbles to pass in the airlocks.
Edit: back on topic, your beer is prolly a-ok