hello, I am thinking of purchasing the tix on undc tour. for 4 days you get 2 free. can I use 2 (will only need 2 days sil going 10 days later)and SIL use the remaining days or do they check id I had read something about finger id? any info would help. Also if anyone has ordered from Und cov. tour. does shipping really take 14 bus. days we are in NJ and leaving on the 21 of Aug. would need tix here by 18th.