There are 2 empty boxes in the arrangement.
i) Box which is of Silver colour is placed at top.
ii) Only white box is placed between Top most box and R.
iii) Box T is White colored.
iv) There are 5 boxes between P and Silver colored box.
v) S is placed immediately above Brown colored box.
vi) Red colored box is placed immediately below Brown colored, which is P.
vii) Number of boxes above P is 1 more than number of boxes below P.
viii) Yellow colored box is placed at bottom.
ix) Number of boxes between P and Q is equivalent to that of between R and S.
x) There are more than 7 boxes between Q and silver colored box.
xi) Only Mustard and Magenta colored boxes are placed between A and P.
xii) A is Pink colored.
xiii) Boxes between T and A are equivalent to that of boxes between R and U.
xiv) Box U is not placed at top.
xv) Box Q is green colored.
xvi) Box blue is placed somewhere above box Brown.
xvii) Box W is not Red colored.
(so, only possibility is W is silver colored).
xviii) More than 1 empty boxes are there.
xix) One of the box placed is V.
xx) Box Y is yellow colored.