Obtain the model instructions, check for visible damage and confirm suitable operation before relying on it for chilled food. A seller's statement that it was plugged in is not a complete condition assessment.
What the observation tells you
Transport, missing fittings and an unknown control setting can affect the first use. Electrical damage, loose doors or unfamiliar modifications need competent advice. Do not carry out internal tests or assume that a recent clean proves safety.
A useful next step
Follow the handling and startup requirements, use appropriate temperature checks and arrange assessment where necessary. Keep food elsewhere until reliable storage conditions are established. Retain any available service history without treating it as a guarantee.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.