Probably there at least several databases with these human proteins. For example, this one:

http://www.trimslabs.com/database/hypodb/Homo.html

or this one:

https://www.researchgate.net/post/How_to_download_all_of_the_hypothetical_human_protein_sequence_from_the_NCBI_database

There is a discussion in this paper what site is better.

See also these papers:

http://www.ijcaonline.org/volume14/number4/pxc3872460.pdf

This paper may be useful too:

http://bmcbioinformatics.biomedcentral.com/articles/10.1186/1471-2105-10-289

In Silico screening for functional candidates amongst hypothetical proteins

and Wiki-page with definition:

https://en.wikipedia.org/wiki/Hypothetical_protein

Unfortunately, 'hypothetical protein' - that's not their only common feature.