I just need to add that this morning I discussed this interesting issue with a priest who is a canon lawyer and pastor. He says that a tabernacle has no other purpose than to be a tabernacle, and is a tabernacle even when not being used to house the Blessed Sacrament.
Any priest would need the permission of his bishop to have a tabernacle in his residence and this is not usually granted. A priest with a tabernacle boxed away in storage, would also need permission from his bishop, and would not be granted. A tabernacle has one purpose and this is to house the Blessed Sacrament.
That is simply not true. It depends on the ordinary. It’s common in my diocese and the neighboring archdiocese for priests, retired priests, and even to a lesser degree deacons and laypersons to repose the Blessed Sacrament in their home chapels with the express written permission of our ordinary. In fact during the regime of the last archbishop of the neighboring archdiocese, every priest was encouraged to prepare a private chapel in their rectories or homes that allowed the repose of the Blessed Sacrament. Further there is nothing that forbids a lay Catholic from owning a tabernacle.
He also says that this can be a formation issue, and seminarians trading or collecting sacred vessels and sacred furnishings sends up red flags. Seminarians who collect chalices, vestments, etc. can be thought to be presuming they are going to be ordained, which may not be the case. Ordination is not something that can be presumed. He said it could be a maturity issue, but is not something that can be justified.
He also stated that the tabernacle in question cannot now be returned to the shop where it was acquired, where it could be used profanely for any other purpose than what it was made and set aside to be. He said it should be turned over to to be under the care and use of the Church. The whole subject should be discussed with the spirual or formation director at the seminary
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I am very relieved that you are willing to turn the whole problem over to you director in a spirit of humility and obedience. God Bless you and I hope you turn this into a learning experience to strengthen your vocation. :)