So, to answer your question, there is no way to configure the broker to insert a timestamp. Nothing in the AMQP specification requires a message to know when it arrives at a broker, and keep in mind that manually setting a timestamp on the broker's side will only represent when the message was received by the broker and not when it was posted.
If you lash out at this, you can write your own RabbitMQ plugin to do this, but I would not recommend doing this. Instead, I would recommend getting your manufacturers to include a timestamp in their message properties.
Resources
RabbitMQ message arrival timestamp
RabbitMQ AMQP.BasicProperties Java API
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