Provided the serial numbers and IMEI between the box and device match, it wasn't supposed to be sold. If the sale has concluded, best of luck. Do check that everything works and that you have been able to register it to your AppleID and iCloud.
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Means that phone was set out as a display so consumers could look and touch it.
Don't know what condition it will be in, if you're not satisfied, return it and get your money back and then buy one from an authorized Apple dealer.
That is a phone provided to a reseller (possibly a carrier) for display. It has special software loaded onto it. It's not intended for resale. Although it may be possible to remove the demo software by restoring the phone as new, it may not. Return it and request a new phone intended for retail sale.
Firstly thanks for helping and I have a more questions!
Do you think that my phone can be blocked in the near future? Also I'm afraid if I update new version maybe blocked!?
It's really hard to say. The phone was never intended to be sold to the consumer.
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What is 'Demo not fol resale' on iphone 7plus box?