It has to be as close possible to 100%, the good news it often is as most hygrometer are often of.
You can use press and seal also if it helps but most importantly try not to mess with your eggs if you do, the people opening their eggs box everyday just to check don't always realize it's a good way to loose humidity.
The true test will be to see how your eggs are doing in a few days (if possible without opening), obviously if they deflate early in the incubation, than you really have a humidity issue.
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