Quoted:
He finally got them back but doesn't have a secure place to store them currently.
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Was it a requirement of the court or who ever that when the guns returned they had to be stored in a secure place?
If not then there is only one statute dealing with secure storage in the home and if one doesn't meet the requirements of that statute they don't have to securely store their firearms in the manor spelled out in that statute.
Sec. 29-37i. (Formerly Sec. 29-37c). Responsibilities re storage of firearms. No person shall store or keep any firearm, as defined in section 53a-3, on any premises under such person's control if such person knows or reasonably should know that (1) a minor is likely to gain access to the firearm without the permission of the parent or guardian of the minor, (2) a resident of the premises is ineligible to possess a firearm under state or federal law, or (3) a resident of the premises poses a risk of imminent personal injury to himself or herself or to other individuals, unless such person (A) keeps the firearm in a securely locked box or other container or in a manner which a reasonable person would believe to be secure, or (B) carries the firearm on his or her person or within such close proximity thereto that such person can readily retrieve and use the firearm as if such person carried the firearm on his or her person. For the purposes of this section, “minor” means any person under the age of eighteen years.
As to your main question about having a friend store them. Probably best to suggest (if you haven't already) that your friend consult with a knowledgeable firearm's lawyer if they want a legal answer or legal advise.
Could the person do what you ask? Yes. Is it legal to do so in this gun hating state? Is it considered a "transfer" when one stores someone else's firearms in their home for that other person? Unknown to those two questions.
Another option is to call around to local FFL's/gun shops and see if any offer a storage service, typically for a fee.
Edit to add: Note that if any of the firearms are post ban assault weapons or NFA items that introduces another set of issues due to the registration requirement of those items and where assault weapons can be possessed and by who they can be possessed.