Some good links for trying to put boxes around equations and the align environment, etc. in LaTeX

http://tex.stackexchange.com/questions/109900/how-can-i-box-multiple-aligned-equations

http://tex.stackexchange.com/questions/20575/attractive-boxed-equations

http://www.latex-community.org/forum/viewtopic.php?f=5&t=3297

http://www.latex-community.org/forum/viewtopic.php?f=46&t=4294

http://tex.stackexchange.com/questions/71025/aboxed-across-multiple-alignment

http://tex.stackexchange.com/questions/134984/putting-frame-only-around-equation-using-mdframed-package

http://www.latex-community.org/forum/viewtopic.php?f=46&t=8144

http://get-software.net/macros/latex/contrib/mh/empheq.pdf

http://tex.stackexchange.com/questions/137287/equation-numbers-for-boxed-multiline-equations