I have checked 95% of the blocks to check they are genuine Lego but I am human and some non genuine one may have made their way into the genuine ones. 

Also included are 2 non genuine Lego boards for your creations
I have taken photos of the sets so you can see what is missing from them
Weight of Box - 1.450Total weight of everything  -9.610
Weights of Lego- (I think I may have missed a measurement or 2 but these ones I weighed.Classic Box Of Lego- 2.245kgUnopened- Lego Roses .145gHarry Potter Lego (Train and people) .949gNon Genuine Lego boards - .310g
3 in 1 creator (bunny bird seal) .415gAlien DJ beatbox .175gFrozen .95gUnopened- 3 in 1 creator (unicorn seahorse bird?)Lego friends purple cart set .200g Pink lego container (EMPTY) .490gBag of small loose lego bits .555gBag of small loose lego bits .485g Small bag of Cars Lego .80g Large bag of mixed loose lego bits 1.000kgAnd a bunch of people .80 gLego book .490g 
I estimated 7.500kg of Lego by taking the total 9.610kg - minus - the container weight 1.450kg - minus the book .490g came at approx 7.700kg but I rounded down.