Whenever a refrigerator of any kind is transported, it should be allowed 24 to 48 hours to sit upright to allow any oil migration to return and settle. Being a new unit, the compressor valves should have kept any oil from leaving the compressor on the high side (discharge) but one can never be certain.
When you bent back the freezer section, did you by chance kink either of the lines? If so, you may not have a leak, but a restriction which could cause hissing noise, since the refrigerant will be inder high pressure and would tend to flash off a bit at the point of restriction. If the unit is cooling, you may be good, but might hear such noise for ever.
You should know in a short time whether or not you have a leak, because the unit will most likely frost up around the evaporator prior to actually entering it. You may have adequate cooling for awhile, but shortly thereafter, you will start to lose you cooling ability as the refrigerant leaks out more.