Build on your relationship with this client, especially as your new to the industry! You've already gained from this experience with the information you had to personally source! Good work!

If you bought for "example" a logo/template from a graphic designer, then they told you had to pay them again for the "Copyright" would you hire them again? Probably not, you would more than likely feel cheated! However in the future, if you wish to reserve the rights to your works, document it in your work agreement or in your terms and conditions.

Good luck with this client, and future endeavours,

Matt.