Tamper-proof packaging made using a material in a sheet, preferably board or cardboard, comprising: - a cover with an L-shaped portion having a first folding line for connection to a first side of the package, designed in such a way that it folds on an opening in order to obtain a closed configuration of the package, wherein one or more objects are held in the package; - at least one tab (12; 13) having a second folding line (14; 15) for connection to a second side (4'; 6') of the package, said second side being positioned crosswise with respect to the first side and being designed in such a way that it folds into the opening so that the tab (12; 13) is covered by the cover in the closed configuration; wherein: - the tab (12; 13) is provided with at least one projection (31; 32) suited to be coupled with the inside of a first slit (27; 28) provided in the cover, the first slit (27; 28) being spaced from the first folding line in such a way that the cover is retained in the closed configuration through the coupling between the projection (31; 32) and the first slit (27; 28); - the cover is provided with at least one tear-off line (21; 22) characterized in that the at least one tear-off line (21; 22) lies crosswise with respect to the first folding line so as to define an L-shaped edge of the cover when the material in a sheet is torn or broken along the tear-off line (21; 22) by a user in order to open the package for the first time; and - one between the L-shaped edge and a third side of the package opposite the first side with respect to the second side (4'; 6') is provided with a lip suited to be coupled with a second slit on the other one between the L-shaped edge and the third side in order to close the opening securely and selectively once the material in a sheet has been broken along the tear-off line (22; 21). - a cover with an L-shaped portion having a first folding line for connection to a first side of the package, designed in such a way that it folds on an opening in order to obtain a closed configuration of the package, wherein one or more objects are held in the package; - at least one tab (12; 13) having a second folding line (14; 15) for connection to a second side (4'; 6') of the package, said second side being positioned crosswise with respect to the first side and being designed in such a way that it folds into the opening so that the tab (12; 13) is covered by the cover in the closed configuration; - the tab (12; 13) is provided with at least one projection (31; 32) suited to be coupled with the inside of a first slit (27; 28) provided in the cover, the first slit (27; 28) being spaced from the first folding line in such a way that the cover is retained in the closed configuration through the coupling between the projection (31; 32) and the first slit (27; 28); - the cover is provided with at least one tear-off line (21; 22) - one between the L-shaped edge and a third side of the package opposite the first side with respect to the second side (4'; 6') is provided with a lip suited to be coupled with a second slit on the other one between the L-shaped edge and the third side in order to close the opening securely and selectively once the material in a sheet has been broken along the tear-off line (22; 21).